SciPy

scipy.special.stdtr

scipy.special.stdtr(df, t) returns the integral from minus infinity to t of the Student t distribution with df > 0 degrees of freedom: gamma((df+1)/2)/(sqrt(df*pi)*gamma(df/2)) * integral((1+x**2/df)**(-df/2-1/2), x=-inf..t) = <ufunc 'stdtr'>

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